Electrical device arrangement, in particular for an item of furniture, with a bus device and bus subscribers, and a method for controlling such electrical device arrangement

ABSTRACT

An electrical device arrangement, in particular for an item of furniture, includes a bus device having wirelessly configured control paths, and bus subscribers connected to the bus device, wherein at least one of the bus subscribers is an operating unit comprising a memory for storing control parameters and a control program and at least one of the bus subscriber is a controller of a furniture drive. A method for controlling such an electrical device arrangement, in particular for an item of furniture, having a bus device and bus subscribers is also disclosed.

CROSS-REFERENCES TO RELATED APPLICATIONS

This application is a divisional application of co-pending U.S.application Ser. No. 12/093,871, filed May 15, 2008, which claims thepriority of PCT International application No. PCT/EP2006/068517, filedNov. 15, 2006, which designated the United States, and which claims thepriority of German Patent Application, Serial No. 10 2005 054 845.8,filed Nov. 15, 2005.

BACKGROUND OF THE INVENTION

The invention relates to an electrical device arrangement, in particularfor an item of furniture, with a bus device and bus subscribers,

Such electrical arrangements are known in form of differentelectric-motor-driven drive configurations for adjusting items offurniture in the context of additional electrical loads, such as lamps,heaters, massagers, and the like. Because of the large variety infurniture design, these devices are configurable in many configurations.A large number of associated control units with power supplies,operating units and various connection designs is also available for theunits to be connected.

Different standardizing measures are known, which not only reduce thevariety of connection types, but also tend to add flexibility to theelectric device arrangements, for example for upgrades and ease ofassembly.

One such example is illustrated in DE 201 07 726 U1, which describes adevice for controlling electrical devices of furniture in modularconstruction, wherein the modules can be plugged together and have datatransmission lines and power supply lines. The data transmission linesform a bus system to which data processing devices are connected insidethe individual modules. The modules also include control circuits forloads, and an operating unit can be connected to at least one module, orone module includes a remote control receiver.

There is a need to further simplify such arrangements and to addflexibility for connecting and controlling additional devices.

There is also a need to employ such electrical device arrangements alsowith items of furniture in areas subject to particular safetyrequirements, for example in nursing home and hospital settings.

SUMMARY OF THE INVENTION

It is therefore an object of the present invention to improve anelectrical device arrangement, in particular for items of furniture,with a bus device and bus subscribers, and to improve over thestate-of-the-art with respect to economy and safety.

The object is attained according to one aspect of the invention by anelectrical device arrangement, in particular for an item of furniture,including a bus device and bus subscribers, wherein the bus device has abus device having wirelessly configured control paths, and bussubscribers connected to the bus device, wherein at least one of the bussubscribers is an operating unit comprising a memory for storing controlparameters and a control program and at least one of the bus subscriberis a controller of a furniture drive.

According to another aspect of the invention, a method for controllingsuch electrical device arrangement, in particular for an item offurniture, with a bus device and bus subscribers connected to the busdevice, wherein at least one of the bus subscribers is an operating unitthat is integrated in a mobile phone, and at least one of the bussubscribers is a controller of a furniture drive, includes the steps ofoperating an input unit of the mobile phone, and transmitting datawirelessly from the mobile phone over a control path of the bus device.

The invention is based on the concept that all bus subscribers connectedvia a bus device are, in addition to the bus lines, connected with anenable line, and that all adhere to the parameter choice from a bussubscriber functioning as a master, wherein the master stores thecontrol parameters in addition to a sequence program. The bussubscribers can recognize each other, address each other fullyautomatically, and communicate with each other.

The electrical device arrangement of the invention, in particular for anitem of furniture, with a bus device and bus subscribers ischaracterized in that the bus device has at least two control paths, twopower paths and at least one enable path.

Implementing the additional enable path advantageously simplifies mutualidentification of the bus subscribers. The enable path also provides orsimplifies the possibility of so-called first fail-safety required withcertain safety standards, allowing a large number of applications. Theenable path has the additional advantage that the signals traveling onthe enable path are only used the for network clearing or a sleep mode,thus allowing to reduce energy consumption when not in use.

In a first embodiment, the bus device includes at least onedaisy-chain-path in form of a line. This advantageously simplifies evenfurther the mutual identification of the bus subscribers. In addition,the enable path and the daisy-chain path can be combined into a singlepath. Several signals are hereby applied to the common path, wherein thecommon path has a first signal for the daisy-chain-linking and at leastone additional signal in form of an enable signal. Advantageously, theform and/or the magnitude of the signals can be different. For example,a first signal for the daisy-chain-linking may be formed by an encodedsignal, whereas the at least one enable signal is formed by at least onesignal having a constant voltage, although the various voltage signalsmay have different amplitudes.

In a preferred embodiment, each subscriber includes at least one controlunit, a basic control unit, a memory unit, and an output unit and/or aninput unit. With this approach, all bus subscribers can be economicallyequipped with the same software. For example, this approachsignificantly simplifies synchronization of subscribers, or of drivesconfigured as drives or as control units of the drives.

Advantageously, the basic control unit is particularly fault-tolerant,and advantageously has an easily comprehensible configuration.

Preferably, the basic control unit and/or the control unit is directlyconnected with the bus device. The basic control unit is used at startupor reset or upgrade for starting a program running in the control unit,wherein the program can be defined ahead of time in the memory unit orcan advantageously be stored with changes permitted.

According to another embodiment, the bus subscriber forming an operatingunit applies signals to the enable path, so that the enable path canaffect the operating state of a selection of bus subscribers or ofindividual groups of bus subscribers.

To this end, a logical, encoded or periodic signal or a definedpotential is applied to the enable line for enablement, whichadvantageously simplifies many interactions with the bus subscribers.

Advantageously, with the respective signal of the at least one enablepath, the operating state of the corresponding bus subscriber can beswitched between an active and a passive and/or optionally also anenergy-saving operating state. This enhances the possible selection.Advantageously, the voltage supply of switching elements, for examplerelays, microprocessors or control units of the individual bussubscribers, can be ensured by using the respective signal of the atleast one enable path. This enhances and/or satisfies the firstfail-safe requirements.

Preferably, the bus device is implemented as a RS 485 interface with atleast one additional enable path, representing a device of high qualityand of a high standard, thereby advantageously ensuringinterference-free data transmission. The RS 485 interface allows data tobe transmitted in half-duplex, which preferably uses a master-slaveconfiguration.

In an alternative embodiment, the bus device is implemented as a CAN-buswith at least one additional enable path.

According to another alternative embodiment, the control paths of thebus device are configured wireless, with the wireless connectionimplemented as a WLAN, DECT or Bluetooth device.

Alternatively, the enable path can be a component of the control pathsof the bus device. This enhances potential applications of theinvention.

According to another embodiment, an additional path with signals formutual identification of the bus subscribers is arranged in addition tothe enable path.

In another alternative embodiment, the bus subscribers form adaisy-chain-linking. Linking begins at a predetermined unit, for examplethe power supply unit, with the linking signal always being set at itsoutput. Each bus subscriber compares the linking signal between itsinput and its output. If the signal is applied only to the input, thenthis bus subscriber confers with other bus subscribers, preferably withthe master which can be implemented as an operating unit. The master nowassigns an address to this bus subscriber which is stored on bothdevices. Finally, this bus subscriber sets the linking signal at itsrespective output, which is already queried from the input of anotherbus subscriber, allowing the other bus subscriber to communicate withthe master and having an address assigned by the master.

In a preferred embodiment, each operating unit has a definiteintelligence, whereas all other bus subscribers have preferably astandardized intelligence. Accordingly, all control parameters and thecontrol programs and all required data are stored on a memory componentof the operating units. The bus device is hence divided in commandingbus subscribers and executing bus subscribers. This has the advantagethat all bus subscribers have the same programs, but that the operatingunits in addition include the program units required for controlling thebus device. This advantageously represents the least complexity when thecontrol program is changed or during programming. The bus device can belater expanded by adding additional bus subscribers, without the needfor a separate program.

According to another preferred embodiment, the electrical devicearrangement can be controlled by data packets which are transmitted viathe bus device, wherein the data packets include at least the address ofa bus subscriber as an address byte, a command byte and a check byte.The data packets can have at least one data byte.

In a preferred embodiment, the address byte is structured in severalparts. For example, the first four bits can contain information aboutaddressing and additional bits information about the length of a dataset. When using four bit information for assigning the address, up to 16bus subscribers can be arranged on a bus device. A command byte whichincludes information for controlling a load or a bus subscriber follows.If needed, additional data bytes can be appended which includeinformation, for example, for updates or for programming. The last byteis a check byte representing a checksum of the entire data set. In thisway, data sets of variable length can be implemented; however, typicaldata sets consists of address byte, command byte and check byte. Becauseof the data sets are very short, data transfer is advantageously reducedto a minimum, resulting in a high degree of reliability and speed.

In a particular preferred embodiment, the bus subscriber which as anoperating unit forms a master, has in its memory unit a program segmentsuitable for forming the control software of the master. By forming amaster, additional operating units can advantageously be employed, forexample on hospital beds, and operated by patients. In addition, theprocessor resources are then distributed in the device arrangement in asimple and comprehensible manner.

Preferably, the control units of all or of individual bus subscribersare not supplied with electric power or are not active when theelectrical device arrangement is not in use. This advantageously reducesthe energy consumption of the arrangement of the invention when not inuse, because such device arrangements are most often not in use. Inanother embodiment, only portions of the individual bus subscribers areactive, so that a power-saving sleep mode can be implemented, forexample for battery operation.

A method for controlling such electrical device arrangement of theinvention, in particular for an item of furniture, with a bus device andbus subscribers has the following method steps:

-   -   operating the input unit of a bus subscriber used as operating        unit;    -   classifying this bus subscriber by way of an enable path as a        bus subscriber having a master function or as an additional bus        subscriber; and    -   controlling the particular bus subscriber addressed by the input        unit.

Preferably, during startup, during a reset command or during upgrades,the basic control unit or the control unit of a corresponding bussubscriber exchanges data with the bus subscriber forming the master viathe bus device for identification. This provides a device arrangementwith a bus device which advantageously is flexible, both with respect todifferent bus subscribers and also with respect to differentapplications of items of furniture.

BRIEF DESCRIPTION OF THE DRAWING

Exemplary embodiments of the invention will now be described withreference to the schematic figures of the drawing.

FIG. 1 is a schematic block diagram of a first exemplary embodiment ofthe arrangement of the invention;

FIG. 2 is a schematic block diagram of an exemplary embodiment of a bussubscriber;

FIG. 3 is an exemplary embodiment of data packets; and

FIG. 4 is a schematic block diagram of a second exemplary embodiment ofthe arrangement of the invention.

Identical reference symbols in the Figures designate identical orsimilar components with identical or similar functionality.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

FIG. 1 shows a schematic block diagram of a first exemplary embodiment10 of the arrangement of the invention.

The device arrangement 10 includes a bus device 11 configured as a RS485 interface with a data path consisting of two control paths. The busdevice 11 also includes at least two power supply paths which provideelectric power from a supply unit 12. The supply unit 12 is located atthe beginning of the bus device 11.

The bus device also includes an enable path.

Bus subscribers 13 . . . 18 are connected to the bus device 11 at anylocation, with connection to the data paths, the supply paths and theenable path. The supply unit 12 also forms a bus subscriber.

In the example illustrated in FIG. 1 the following bus subscribers 13 .. . 18 are shown: a PC unit 13, a first operating unit 14, a load 15, afirst control unit 16, a second operating unit 17, and a second controlunit 18.

The device arrangement 10 is only shown in exemplary form and can, forexample, be an electrical device arrangement on a hospital bed, which isnot illustrated.

The PC unit 13 is here a personal computer supplying data to the datapaths of the bus device 11, for example to initially store data inmemory units of the bus subscribers for adapting the electrical devices,when the device arrangement 10 is started up or serviced. The datainclude, for example, tables about the stroke of the drives etc. Theprograms of individual or of all bus subscribers 13 . . . 18 can bechanged, updated or exchanged by using the PC unit 13 or anotherportable programming device.

The first operating unit 14 is a manual switch used to control allfunctions of the electrical device arrangement 10. The switch includesinput and output functions which will be described below, as well as thecontrol program for the device arrangement. The load 15 in this exampleis a lamp.

The first controller 16 is provided for a first drive 20, which may be,for example, a dual drive for adjusting a slotted frame of the hospitalbed. The controller also includes a power unit 41 which is connectedwith the first drive 20. Its function will be described below.

A second operating unit 17 is a so-called manual patient switch withlimited functionality, i.e., the patient in the hospital bed can onlyoperate those functions of the electrical device arrangement 10 of thehospital bed permitted for that patient, for example the patient canadjust only the head section.

The system can be adapted to the respective patient by replugging thesecond operating unit or by reprogramming the second operating unit withthe PC unit 13. The device arrangement 10 can, of course, beadvantageously and easily used also for other items of furniture byeliminating the second operating unit 17.

The second controller 18 also includes a power unit 41 which isconnected with second drives 21 which in the exemplary embodiment areseparate drives for height adjustment of the bed, which will notdescribed in detail.

The supply unit 12 is also a bus subscriber.

For example, the drives 20, 21 can be synchronized via the bus device11.

Each bus subscriber 12 . . . 18 is provided with a process controller,as described in more detail below with reference to FIG. 2.

FIG. 2 shows a schematic block diagram of an exemplary embodiment of abus subscriber 13 . . . 18.

The bus subscriber 13 . . . 18 includes the following: a control unit30, preferably a processor, a basic control unit 31, a memory unit 32,an output unit 33 with outputs 35, and an input unit 34 with inputs 36.

The control unit 30 is connected with the bus device 11, i.e., with thedata paths and power paths and with the enable path. In anotherembodiment, the basic control unit 31 is directly connected with the busdevice 11. The control unit 30 is furthermore connected with the basiccontrol unit 31, the memory unit 32 and the units for output 35 andinput 34.

If the bus subscriber is a controller of a drive 20, 21, then the outputunit 33 is configured as a power unit 41 with an output 35 forconnection to the respective drive 20, 21, which is not described indetail. The input unit 34 is used for receiving control signals fromtransducers of the drive 20, 21, for example for position measurement.

If the bus subscriber is an operating unit 14, 17, then the input unit34 is connected with a keyboard. This keyboard can also be a touchscreenor the like. The output unit 33 is, for example, configured forconnection to a display screen or indicator lights.

The memory unit 32 includes predefined data values, either individual orin table form, which can still be changed later by the PC unit 13 orautomatically during operation. The defined data values are identityinformation and information about the capability and functionality ofthe respective bus subscriber.

With respect to the first operating unit 14, the memory unit 32 includesthe control program for the device arrangement 10.

When the device arrangement 10 starts up, is serviced, reset, or startedagain, then the basic control unit 31 takes over the start of theprogram residing in the memory unit 32 of each bus subscriber 12 . . .18, and organizes updates/upgrades of the control software of theoperating system of the respective bus subscriber 12 . . . 18. The basiccontrol unit 31 is also referred to as BIOS (Basic Input/Output System).

In another embodiment, each operating unit 14, 17 includes a memory unit32 and a control program for the device arrangement 10.

The control unit 30 checks the data paths for a data set intended forthe control unit 30, i.e., the address of the bus subscriber in whichthe control unit 30 resides. After receipt of such data set (to bedescribed later), the transmitted control command, for example “turn onlamp”, is executed. On the drives, the control unit 30 monitors theactual position of the drive and optionally returns data about theposition to its control device, in this case the first operating unit14, via the data paths of the bus device 11, wherein the control devicecompares the actual position with desired comparison values of thedevice arrangement and continues to operate the drive, or usesadditional control commands to switch the drive off.

The respective bus subscriber 12 . . . 18 can only execute these controlcommands if the subscriber is enabled via the enable path. To this end,a signal is applied to the enable path, for example by pressing a key,which activates either all bus subscribers 12 . . . 18 or selectivelyonly certain bus subscribers. This can be accomplished with a logical,encoded or periodic signal or with a switching signal or a certainpotential. The signal can be monitored, so that, for example, wirebreaks can be detected.

In a modification of this embodiment, several enable paths can beprovided which can be assigned to different groups of bus subscribers 13. . . 18. The enable paths can be exclusively integrated in the busdevice 10 or can be routed to the individual bus subscribers 13 . . . 18over a dedicated path.

In another advantageous embodiment, the enable line ensures that voltageis supplied to switching devices, for example relays, microprocessors orcontrol units 30 of the individual bus subscribers 13 . . . 18. Anothermodification of this embodiment provides an operating unit which islocated remote from the operating unit 14, for example, mounted on thebed frame as a switching console with a switch which switches the signalof the enable line.

When a key is pressed on the first operating unit 14, a data packet 50is applied to the data paths of the bus device 11, as illustrated inFIG. 3. The first operating unit 14 can be defined as the unit thatbegins operation as the first subscriber on the bus device 10, therebyforming the master.

The data packet 50 in this exemplary embodiment consists of bytes 51-1to 51-18: an address byte 52 with byte number 53, a control byte 54,data bytes 55, and a check byte 56.

Depending on the transmitted data packet, at least three bytes 52 and53, 54 and 56 are transmitted. In this exemplary embodiment, the addressbyte 52 consists of four bits, resulting in at most 16 bus subscribers.In a modification of the illustrated exemplary embodiment, each byte canconsist of individual bits or several bytes, so that the bus device canbe individually adapted.

The address byte 52 carries the address of the addressed bus subscriber,the byte number represents the number of the bytes 51-1 to 51-18 of thedata packet 50, the control byte 54 carries the encoded control commandfor the corresponding addressed bus subscriber, the data bytes 55contain the data values to be transmitted, and the check byte 56 is usedto check the data packet 50 and can be formed by a checksum, which willnot be described in detail. It should be noted that in the exemplaryembodiment, the length of the data bytes 55 is formed from the bytes51-3 to 51-17, having the exemplary indicated byte length of only 15bytes. The length of the data byte depends on the quantity of thetransmitted data as required, for example, during an update.

The startup and initialization of the device arrangement will now bedescribed.

In the illustrated example, bus subscribers having the same propertiesare used, providing a high degree of flexibility. These have differentaddresses for identification. To obviate the need for placing encodingswitches in the bus subscribers, a daisy-chain-path is employed.

Addresses are assigned at each key activation or setting of the enablepath. This has the advantage that the entire system can be checked forcomplete functionality, and the addition or removal of subscribers isrecognized automatically. Preferably, the bus device 11 consists of anRS485 interface with the additional enable path used for signaling,indicating that a master has seized the bus device 11. This path canalso be used for network release. The master can also include a powersupply with a battery/rechargeable battery. The enable path can also beused to affect the operating states of a respective bus subscriber.

The bus device 11 furthermore has a daisy-chain-path.

The supply unit 12 is always arranged at the beginning of the bus device11 and sets the daisy-chain-path to a predefined value.

Upon key activation, it is checked if the enable path has a certainsignal or potential. If this is not detected, then the bus subscriberwhere the key was activated becomes the master. The enable pathindicates if the master already exists. The bus subscriber then waits tobe addressed with its bus address by the existing master. The bussubscriber then stores all addresses with the association of all bussubscribers.

If the bus subscriber is the master, then it sets the enable path to acertain signal, causing all bus subscribers to perform aninitialization. The daisy-chain-path is set to a certain value.

All bus subscribers must be operational within a certain time, forexample within 10 ms.

The bus subscriber which is connected immediately after the supply unit,has at its daisy-chain-input the defined data value of the supply unit12. This bus subscriber responds to the address and answers with its ownidentity and stores the address with which it was addressed. In theexceptional case where the master is that particular bus subscriber,then it assigns the address to itself and sends its identity to the busdevice 11 and queries for the next bus subscriber. In this way, all bussubscribers are registered, and the master terminates initializationafter receiving the last answer after a certain elapsed time intervalof, for example, 10 ms, or if no answer is received, after a preset timeinterval.

The invention is not limited to the afore-described subject matter, butcan be modified in various ways.

For example, in a second exemplary embodiment of the device arrangement10 of the invention shown in FIG. 4, an electric-motor-driven drive unit40 can be implemented as a bus subscriber and include the controller 16with the power unit 41.

The bus device 11 can be configured, for example, asdaisy-chain-linking. The bus device 11 can also be implemented as a CANbus.

The enable path can provide so-called first fail-safety, by switchingthe enable path directly with a key on the master operating unit 14. Ifno first fail-safety is required, then the enable path can be switchedby a logic circuit or the processor of the master.

The enable path can switch a network release in the supply unit 12, forexample, as an additional bus subscriber. Alternatively, the enable pathcan also switch the bus subscribers between an operating mode and anon-operating mode to save energy.

Moreover, the enable path can affect the control unit 30 or the output35 such as not to switch the output 35 in the absence of the enablesignal, which may prevent an unintentional start up of, for example, amotor of a drive, or turn-on of a load 15, 20, 21, 40. In addition, thecontrol unit 30 of each bus subscriber 13 . . . 18 can deactivate theoutput 35 after a preset time interval, after which data packets are nolonger received.

The control units 31 of the bus subscribers, with the exception of themaster, are supplied with energy only following key activation on themaster.

It would also be feasible to implement the data paths of the bus device11 in wireless form, configured for example as a Bluetooth or DECTnetwork similar to a WLAN configuration. In this case, only two linesfor supply or power paths to the bus subscribers are required, inparticular to drive units and loads, such as lamps, etc. The operatingunits can then be powered by a battery or rechargeable battery. Theycan, for example, also be integrated in a mobile telephone.

If at least one bus subscriber 13 . . . 18 is powered by a rechargeablebattery, then the signal from the enable line switches the correspondingbus subscriber 13 . . . 18 or at least the control unit 30 between anoperating mode and a power-saving sleep mode.

A bus subscriber can also be a sensor.

What is claimed as new and desired to be protected by Letters Patent isset forth in the appended claims:

What is claimed is:
 1. An electrical device arrangement for items offurniture, comprising a bus device having wirelessly configured controlpaths, and bus subscribers connected to the bus device, wherein at leastone of the bus subscribers is an operating unit comprising a memory forstoring control parameters and a control program and at least one of thebus subscriber is a controller of a furniture drive.
 2. The arrangementas claimed in claim 1, wherein the operating unit includes a programcontrolling the bus device.
 3. The arrangement as claimed in claim 1,wherein the operating unit operates as a bus master.
 4. The arrangementas claimed in claim 1, wherein the operating unit comprises a keyboardas an input unit.
 5. The arrangement as claimed in claim 4, wherein thekeyboard comprises a touch screen.
 6. The arrangement as claimed inclaim 4, wherein the operating unit is integrated in a mobile phone. 7.An electrical device arrangement for items of furniture, comprising abus device having wirelessly configured control paths, and bussubscribers connected to the bus device, wherein at least one of the bussubscribers is an operating unit integrated in a mobile phone and atleast one of the bus subscriber is a controller of a furniture drive. 8.The arrangement as claimed in claim 7, wherein the operating unitcomprises a keyboard as an input unit.
 9. The arrangement as claimed inclaim 8, wherein the keyboard is a touch screen.
 10. A method forcontrolling a device arrangement for items of furniture, the devicearrangement comprising a bus device and bus subscribers connected to thebus device, wherein at least one of the bus subscribers is an operatingunit that is integrated in a mobile phone, and at least one of the bussubscribers is a controller of a furniture drive, the method comprisingthe steps of: operating an input unit of the mobile phone, andtransmitting data wirelessly from the mobile phone over a control pathof the bus device.
 11. The method as claimed in claim 10, wherein thedata is transmitted via at least one of Bluetooth and WLAN.
 12. Themethod as claimed in claim 10, wherein the operating unit includes aprogram for controlling the bus device.
 13. The method as claimed inclaim 12, wherein the program for controlling the bus device isconfigured to be updated.
 14. The method as claimed in claim 10, whereinthe operating unit controls loads.
 15. The method as claimed in claim14, wherein the loads include lamps.
 16. The method as claimed in claim10, wherein the operating unit comprises an input unit for receivingcontrol signals from transducers of the drive.
 17. The method as claimedin claim 16, wherein the control signals include a position measurement.18. The method as claimed in claim 10, wherein the operating unitcomprises an output unit.
 19. An electrical device arrangement for itemsof furniture, comprising a bus device, and bus subscribers, wherein atleast one of the bus subscribers is an operating unit comprising amemory for storing control parameters and a control program forcontrolling the bus device and wherein at least one of the bussubscribers is a controller of a furniture drive, wherein the operatingunit is configured to control functions of the electrical devicearrangement.
 20. The arrangement as claimed in claim 19, wherein theoperating unit comprises an input unit for receiving control signalsfrom transducers of the furniture drive.
 21. The arrangement as claimedin claim 20, wherein the control signals include a position measurement.22. The arrangement as claimed in claim 21, wherein the operating unitcompares an actual position of the furniture drive with desiredcomparison values and controls the drive according to the comparison.23. The arrangement as claimed in claim 19, wherein the operating unitcomprises a keyboard as an input unit.
 24. The arrangement as claimed inclaim 23, wherein the keyboard is a touch screen.
 25. The arrangement asclaimed in claim 23, wherein the operating unit is integrated in amobile phone.
 26. The arrangement as claimed in claim 19, whereincontrol paths of the bus device are configured wirelessly.
 27. Thearrangement as claimed in claim 26, wherein the control paths of the busdevice are configured as at least one of Bluetooth and WLAN.